28945988 has 12 divisors (see below), whose sum is σ = 52024812. Its totient is φ = 14081760.

The previous prime is 28945981. The next prime is 28945993. The reversal of 28945988 is 88954982.

It can be written as a sum of positive squares in 2 ways, for example, as 25381444 + 3564544 = 5038^2 + 1888^2 .

It is a super-2 number, since 2×28945988² = 1675740442592288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28945981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97643 + ... + 97938.

It is an arithmetic number, because the mean of its divisors is an integer number (4335401).

Almost surely, 2^28945988 is an apocalyptic number.

It is an amenable number.

28945988 is a deficient number, since it is larger than the sum of its proper divisors (23078824).

28945988 is a wasteful number, since it uses less digits than its factorization.

28945988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195622 (or 195620 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 53.

The square root of 28945988 is about 5380.1475816189. The cubic root of 28945988 is about 307.0408261267.

The spelling of 28945988 in words is "twenty-eight million, nine hundred forty-five thousand, nine hundred eighty-eight".